| Commit message (Collapse) | Author | Age | Files | Lines |
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`connection_adapters/mysql/type_metadata.rb`
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Prevent destructive action on production database
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Simply `{update|delete}_sql` aliases to `{update|delete}`.
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Before:
```
SELECT 1 AS one FROM "topics" WHERE "topics"."title" = 'abc' LIMIT $1 [["LIMIT", 1]]
```
After:
```
SELECT 1 AS one FROM "topics" WHERE "topics"."title" = $1 LIMIT $2 [["title", "abc"], ["LIMIT", 1]]
```
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Add `columns_for_distinct` for MySQL 5.7 with ONLY_FULL_GROUP_BY
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In MySQL 5.7.5 and up, ONLY_FULL_GROUP_BY affects handling of queries
that use DISTINCT and ORDER BY. It requires the ORDER BY columns in the
select list for distinct queries, and requires that the ORDER BY include
the distinct column.
See https://dev.mysql.com/doc/refman/5.7/en/group-by-handling.html
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Follow up to #19359 and avoid #22241.
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Correctly cache create_table_info
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Follow up to #21664.
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A `(?:var)?binary` with default '' is a correct definition.
Remove `missing_default_forged_as_empty_string?` method for fixing this
issue because this method is a workaround for older mysql legacy adapter
(19c99ac, f7015336).
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`join_to_delete` is same as `join_to_update`
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Reapply #22615.
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Follow up to #22642.
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kamipo/join_to_delete_is_same_as_join_to_update"
This reverts commit 4d06ea9a829de8f6f5a345589828e182eacab6a3, reversing
changes made to e9d15072a94e2ae4dec5b7a121c84a5db38547b8.
Reason: This will break oracle-enhanced, see
https://github.com/rsim/oracle-enhanced/blob/3c42131db82b64ac41645db3affc6e4650289df6/lib/active_record/connection_adapters/oracle_enhanced_adapter.rb#L1254
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`pool` in args is unused anymore. And `config` is used in all adapters.
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Not needed for `Mysql2Adapter` and `AbstractMysqlAdapter`.
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kamipo/not_passing_native_database_types_to_table_definition
Not passing `native_database_types` to `TableDefinition`
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The `native_database_types` only used in `TableDefinition` for look up
the default `:limit` option. But this is duplicated process with
`type_to_sql`. Passing `native_database_types` is not needed.
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Not needed for `Mysql2Adapter` and `AbstractMysqlAdapter`.
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This reverts commit 8246b593bff71f2cebf274c133bb8917f1e094c8.
There was concern about this modifying the behavior of past migrations.
We're going to add an way to modify the migration generator instead.
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It's often the case that you want to have an option that you cannot
specify at the database level, but want applied to *all* tables that you
create. For example, you might want to specify `ROW_FORMAT=DYNAMIC` to
not have to limit text columns to length 171 for indexing when using
utf8mb4. This allows an easy way to specify this in your database
configuration.
While this change affects both MySQL and MySQL2, the test only covers
MySQL2, as the legacy mysql adapter appears to always return ASCII
strings, and is tangential to what we're actually doing.
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- key was a poor choice of name. A key implies something that will
unlock a lock. The concept is actually more like a 'lock identifier'
- mysql documentation calls this a 'lock name'
- postgres documentation calls it a 'lock_id'
- Updated variable names to reflect the preferred terminology for the database in
question
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Reported on #21509, how views is treated by `#tables` are differ
by each adapters. To fix this different behavior, after Rails 5.0
is released, deprecate `#tables`.
And `#table_exists?` would check both tables and views.
To make their behavior consistent with `#tables`, after Rails 5.0
is released, deprecate `#table_exists?`.
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- Addresses issue #22092
- Works on Postgres and MySQL
- Uses advisory locks because of two important properties:
1. The can be obtained outside of the context of a transaction
2. They are automatically released when the session ends, so if a
migration process crashed for whatever reason the lock is not left
open perpetually
- Adds get_advisory_lock and release_advisory_lock methods to database
adapters
- Attempting to run a migration while another one is in process will
raise a ConcurrentMigrationError instead of attempting to run in
parallel with undefined behavior. This could be rescued and
the migration could exit cleanly instead. Perhaps as a configuration
option?
Technical Notes
==============
The Migrator uses generate_migrator_advisory_lock_key to build the key
for the lock. In order to be compatible across multiple adapters there
are some constraints on this key.
- Postgres limits us to 64 bit signed integers
- MySQL advisory locks are server-wide so we have to scope to the
database
- To fulfil these requirements we use a Migrator salt (a randomly
chosen signed integer with max length of 31 bits) that identifies
the Rails migration process as the owner of the lock. We multiply
this salt with a CRC32 unsigned integer hash of the database name to
get a signed 64 bit integer that can also be converted to a string
to act as a lock key in MySQL databases.
- It is important for subsequent versions of the Migrator to use the
same salt, otherwise different versions of the Migrator will not see
each other's locks.
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This issue was resolved by #21687 already. But re-add args by #18856.
`#tables` extra args was only using by `#table_exists?`. This is for
internal API. This commit will remove these extra args again.
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The `SHOW TABLES LIKE` command accepts metacharacters `%` and `_` in
potentially unexpected ways. This can be avoided by querying `information_schema.tables`
directly.
Fixes #17897
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Prior to this commit, Rails makes no differentiation between whether a
query uses bind parameters, and whether or not we cache that query as a
prepared statement. This leads to the cache populating extremely fast in
some cases, with the statements never being reused.
In particular, the two problematic cases are `where(foo: [1, 2, 3])` and
`where("foo = ?", 1)`. In both cases we'll end up quoting the values
rather than using a bind param, causing a cache entry for every value
ever used in that query.
It was noted that we can probably eventually change `where("foo = ?",
1)` to use a bind param, which would resolve that case. Additionally, on
PG we can change our generated query to be `WHERE foo = ANY($1)`, and
pass an array for the bind param. I hope to accomplish both in the
future.
For SQLite and MySQL, we still end up preparing the statements anyway,
we just don't cache it. The statement will be cleaned up after it is
executed. On postgres, we skip the prepare step entirely, as an API is
provided to execute with bind params without preparing the statement.
I'm not 100% happy on the way this ended up being structured. I was
hoping to use a decorator on the visitor, rather than mixing a module
into the object, but the way Arel has it's visitor pattern set up makes
it very difficult to extend without inheritance. I'd like to remove the
duplication from the various places that are extending it, but that'll
require a larger restructuring of that initialization logic. I'm going
to take another look at the structure of it soon.
This changes the signature of one of the adapter's internals, and will
require downstream changes from third party adapters. I'm not too
worried about this, as worst case they can simply add the parameter and
always ignore it, and just keep their previous behavior.
Fixes #21992.
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Add stored procedure test in mysql2
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Currently `tinyblob` is dumped to `t.binary "tiny_blob", limit: 255`.
But `t.binary ... limit: 255` is generating SQL to `varchar(255)`.
It is incorrect. This commit fixes this problem.
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Current master branch includes many schema dumping improvements.
It extract these features to the appropriate files.
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Current master branch includes many schema creation improvements in
MySQL. It extract these features to the appropriate file.
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Current master branch includes many schema definition improvements in
MySQL. It extract these features to the appropriate file.
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`pk_and_sequence_for` is implemented for PG and MySQL adapters (not
implemented for Sqlite3 adapter). But MySQL adapters are not using
`pk_and_sequence_for` already.
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These new methods are used from the Active Record model layer to
determine which relations are viable to back a model. These new methods
allow us to change `conn.tables` in the future to only return tables and
no views. Same for `conn.table_exists?`.
The goal is to provide the following introspection methods on the
connection:
* `tables`
* `table_exists?`
* `views`
* `view_exists?`
* `data_sources` (views + tables)
* `data_source_exists?` (views + tables)
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`table_exists?` calls `tables` twice when passed `'dbname.tblname'` arg.
This change is that `table_exists?` execute only once query always and
extra args of `tables` is removed.
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Add `unsigned` support for numeric data types in MySQL
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In the case of using `unsigned` as the type:
create_table :foos do |t|
t.unsigned_integer :unsigned_integer
t.unsigned_bigint :unsigned_bigint
t.unsigned_float :unsigned_float
t.unsigned_decimal :unsigned_decimal, precision: 10, scale: 2
end
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